El-Salem K, Khalil H, Al-Sharman A et al (2021) Serum vitamin d inversely correlates with depression scores in people with multiple sclerosis
Additinally, I didnt plan to watch a video learning about the incredible array of benefits from GHK-Cu, but the YT vid you posted with Dr Quinn Stillson, breaking down the physiology, current levels of research, efficacy, risks and benefits of topical vs sub -cu, was simply phenomenal

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Avoiding the supplement during these phases is better unless a doctor recommends it
It is possible to increase glutathione with good sleep, reducing stress, getting a good balanced diet, living an active lifestyle, avoiding drinking too much alcohol, and even trying some supplements like milk thistle (more information)